When I was a kid I used to measure the price of things in units of Mars Bars (a popular chocolate teeth desctructor in the UK).
as a frequent cyclist (coommuniter) since 1981, I measure time in units of changing inner tubes (around 3 minutes with relevant kit)
I now measure credit and debt in books (loaned) and far prefer pounds (livres) as a measure of weight (4 apples) than kilos (enough potatoes for a rugby team).
SI units do not pass the usability criteria - just think of 1 Farad capacitor, or a 1 Tesla magnetic field - what were these guys doing when they came up with those? :-)
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